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An unused input to a TTL NAND gate acts like
- a)a low level
- b)a high level
- c)a tri-state input
- d)an open circuit
Correct answer is option 'B'. Can you explain this answer?
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An unused input to a TTL NAND gate acts likea)a low levelb)a high lev...
An unused (or unconnected) input in a TTL gate acts as a high because an open input results in a reverse biased emitter junction of the input transistor, just as a high level does
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An unused input to a TTL NAND gate acts likea)a low levelb)a high lev...
Unused Input to a TTL NAND Gate
Unused input to a TTL NAND gate acts like a high level. Let's break down the explanation in detail:
Explanation:
- When an input to a TTL (Transistor-Transistor Logic) NAND gate is left unconnected or unused, it is considered to be in a floating state.
- In TTL logic, when an input is left floating, it tends to float towards a high voltage level due to the internal circuit configuration.
- The internal pull-up resistors in the TTL NAND gate configuration cause the floating input to be interpreted as a high logic level.
- This behavior is different from CMOS (Complementary Metal-Oxide-Semiconductor) logic gates where an unused input is generally considered as a high impedance or a floating state.
- Therefore, in the case of a TTL NAND gate, an unused input is effectively treated as a high level.
In conclusion, an unused input to a TTL NAND gate acts like a high level due to the internal pull-up resistors that cause the floating input to be interpreted as a high logic level.
Unused input to a TTL NAND gate acts like a high level. Let's break down the explanation in detail:
Explanation:
- When an input to a TTL (Transistor-Transistor Logic) NAND gate is left unconnected or unused, it is considered to be in a floating state.
- In TTL logic, when an input is left floating, it tends to float towards a high voltage level due to the internal circuit configuration.
- The internal pull-up resistors in the TTL NAND gate configuration cause the floating input to be interpreted as a high logic level.
- This behavior is different from CMOS (Complementary Metal-Oxide-Semiconductor) logic gates where an unused input is generally considered as a high impedance or a floating state.
- Therefore, in the case of a TTL NAND gate, an unused input is effectively treated as a high level.
In conclusion, an unused input to a TTL NAND gate acts like a high level due to the internal pull-up resistors that cause the floating input to be interpreted as a high logic level.
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An unused input to a TTL NAND gate acts likea)a low levelb)a high levelc)a tri-state inputd)an open circuitCorrect answer is option 'B'. Can you explain this answer?
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